Method for preparing composite anode material of super capacitor lithium titanate

A technology for supercapacitors and negative electrode materials, applied in the field of materials, can solve the problems of complex process, large capacity attenuation, complicated steps, etc., and achieve the effects of simple process steps, uniform particle distribution, and high safety performance.

Active Publication Date: 2012-09-26
HUAWEI TEHCHNOLOGIES CO LTD
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Problems solved by technology

In this preparation method, elemental copper is coated in lithium titanate to improve the conductivity of the material, and also increase the charge-discharge specific capacity of the material, but after the first charge-discharge, the capacity decays greatly, and its 1C first-time discharge capacity is 209.2 mAh / g, attenuated to 177.5mAh / g in the second cycle, and the toxic substance formaldehyde is used in the process, the process is complicated and the steps are cumbersome

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  • Method for preparing composite anode material of super capacitor lithium titanate
  • Method for preparing composite anode material of super capacitor lithium titanate
  • Method for preparing composite anode material of super capacitor lithium titanate

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Embodiment Construction

[0020] The preparation method of the supercapacitor lithium titanate composite negative electrode material comprises the following steps:

[0021] A. According to Li 4 Ti 5 o 12 The mass ratio of each element in is weighed Li respectively 2 CO 3 Powder, TiO 2 Powder and appropriate amount of dispersant. More specifically, Li 2 CO 3 Powder, TiO 2 The weight ratio of powder and dispersant is 3:7.5:(9-19). The dispersant is alcohol, and the concentration of the alcohol is not limited, and usually the concentration is not less than 50wt%. The function of alcohol is to make Li 2 CO 3 Powder and TiO 2 The powder is mixed well.

[0022] B. Put the above raw materials into a mixing tank for mixing, then put them into a ball mill for ball milling, dry the milled materials, then sinter, and cool to room temperature after sintering. More specifically, put the mixed raw materials into a planetary ball mill for ball milling for 7.5-8.5 hours, take them out and dry them in an ...

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Abstract

The invention provides a method for preparing a composite anode material of super capacitor lithium titanate, which is used for solving the problems that the negative electrode material of the super capacitor, which is prepared according to the existing method for preparing the negative electrode material of the super capacitor, has insufficient property, pollution and the like. The preparing method comprises the following steps: A, respectively weighing Li2CO3 powder, TiO2 powder and a proper amount of dispersing agent based on mass ratio of each element in Li4Ti5O12; B, mixing the raw materials in a mixing tank, placing the mixture in a ball mill for ball-milling, drying the materials subject to the ball-milling, sintering, and cooling to room temperature; and C, adding CuO to the cooled materials, wherein the weight of the CuO is equal to 3-6% of that of the cooled materials, carrying out ball-milling, drying, sintering, cooling to room temperature, porphyrizing and drying to obtain the composite anode material. The method for preparing the composite negative electrode material of the super capacitor lithium titanate has the advantages of simple technology, high material property, no pollution, and high cyclical stability.

Description

technical field [0001] The invention belongs to the technical field of materials, and relates to a supercapacitor negative electrode material, in particular to a method for preparing a supercapacitor lithium titanate composite negative electrode material. Background technique [0002] Supercapacitor battery refers to a new energy storage device that combines electric double layer capacitor energy storage and lithium ion deintercalation energy storage. It has high energy density and high power density. Energy storage devices with high energy density, high power density and other performances are widely used in fields such as information and instrumentation. At present, the research on supercapacitor battery energy storage devices has gradually become a hot spot. As one of the key materials for supercapacitor batteries, the anode material should have the characteristics of both lithium ion battery anode materials and supercapacitor electrode materials. [0003] "Electrochemi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01G9/042
CPCY02E60/13
Inventor 段文升李传海由毅丁勇李书福杨健赵福全
Owner HUAWEI TEHCHNOLOGIES CO LTD
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